ES2675571T3 - Method, device and system to assign a corresponding tax port number to a time interval - Google Patents

Abstract

A method of assigning a tributary port number, comprising: receiving (201) a service path request message that is sent by a neighboring node and carries a type of service, in order to request the establishment of a service path. service used to support an optical channel data unit, ODU, service type service; determine (202), in accordance with the service trail request message, an OTU optical channel transport unit link, used to support the ODU service, determine and reserve, according to the type of service in the message trail request form, a free tributary interval resource used to support the ODU service on the OTU link, and assigning a tributary port number to the free tributary interval resource, in which the allocation of the tributary port number to the free tax range includes: if multiplex structure identifier, MSI, bytes in the OTU link indicate a service type of the ODU service, get tax port numbers used by the ODU services that have the same type as the ODU service in the OTU link and assign a different tax port number from the obtained tax port numbers to the free tax interval resource; or if the MSI bytes on the OTU link do not indicate a service type of the ODU service, obtain tributary port numbers used by all types of ODU services on the OTU link and assign a tributary port number other than the tributary port numbers obtained to the free tax interval resource and send (203) a service path confirmation message to the neighboring node, in which the service path confirmation message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the free tax interval resource.

Description

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DESCRIPTION

Method, device and system to assign a corresponding tax port number to a time interval

FIELD OF THE INVENTION

The present invention relates to the field of communication technologies, and in particular, to a method, a device and a system for assigning a tax port number.

BACKGROUND OF THE INVENTION

Optical transport network technology (abbreviated OTN) is a basic technology of new generation transport networks, which includes technical specifications of an electrical layer and an optical layer and can implement flexible planning and a large capacity service management, and gradually becomes a main technology of backbone transport networks.

At the outset, the OTN standard (ITU-TG.709) defines three OTN containers: an optical channel data unit (in short “Optical Channel Data Unit”, shortly ODU) 1, an ODU2 unit, and an ODU3 unit, whose Tax interval types are all 2.5 Gb / s, and the speed levels of the ODU1 unit, the ODU2 unit and the ODU3 unit are 2.5 Gb / s, 10 Gb / s, and 40 Gb / s respectively . The ODU1 unit includes 1 tax interval, the ODU2 unit includes 4 tax intervals, and the ODU3 unit includes 16 tax intervals. The OTN standard is extended on the basis of the original standard to support Ethernet and other new services and fit into new application scenarios, and new types of signals are proposed, for example, an ODU0 unit (with a switching granularity of 1 , 25 Gb / s) suitable for transmitting signals at low speed, an ODU4 unit (with a switching granularity of 100 G) suitable for transmitting at higher speeds, and an ODU2e unit, an ODU3e1 unit, an ODU3e2 unit, and a ODUflex unit of variable bandwidth.

To multiplex a low speed ODU unit into a high speed ODU unit to transmit services, a multiplexing relationship between ODU units is further defined in the OTN standard. According to the multiplexing relationship, ODU units are classified into a low-order ODU unit (in English “Lower Order ODU”, abbreviated LO ODU) and a high-order ODU unit (in English “Higher Order ODU”, abbreviated HO ODU). A low-order ODU unit can be multiplexed into a high-order ODU unit, and encapsulated as an optical channel transport unit (abbreviated OTU), which is transmitted by a link. During the process of multiplexing the ODU unit, a tax port number (in English “Tributary Port Number”, abbreviated TPN) has to be configured for two adjacent nodes manually in a network management system, so that the ODU unit of on order it is multiplexed into a high-order ODU link, namely an OTU link between the two adjacent nodes according to the assigned TPN number. The TPN number is manually configured on each link. Therefore, the configuration of the TPN number implies a huge workload and a high error rate.

The document: FU M KE AND BAO ZTE CORPORATION X: GENERALIZED MULTI - PROTOCOL LABEL SWITCHING (GMPLS) SIGNALING EXTENSIONS FOR G.709 AMENDMENTS OPTICAL TRANSPORT NETWORKS CONTROL; DRAFT-FUXH - CCAMP - GMPLS-EXTENSION - FOR - EVOLUTIVE-OTN - 00.TXT, INTERNET ENGINEERING TASK FORCE, IETF; STANDARDWORKINGDRAFT, I, June 25, 2009 (2009-06-25), XP015062852 discloses a GMPLS signaling extension (generalized multi-protocol tag switching) to control optical transport networks (OTN) that include ODU0, ODU1, ODU2 units , ODU2e, ODU3, ODU3e1, ODU3e2, ODU4 and ODUflex. It also describes the interactions between pre-G.709 and G.709 Amendment 3 recommendations.

The document "Interfaces for the Optical Transport Network (OTN); G.709 / Y.1331 (2003) Amendment 3 (04/09)", ITU-T STANDARD, INTERNATIONAL TELECOMMUNICATION UNION, GENEVA; CH, no. G.709 / Y.1331 (2003) Amendment 3 (04/09), April 22, 2009 (2009-04-22), XP017433778 discloses extensions to the second version (03/2003) of ITU-T Recommendation G .709 / Y.1331, related to the addition of: an ODU0 and OPU0 unit (“Optical Channel Payload Unit”) and transport of a 1000BASE-X (1 GE) signal over a ODU0 unit; an ODU2e and OPU2e unit and transport of CBR10G3 (10GE) and FC-1200 signals over an ODU2e unit; an OTU4, ODU4 and OPU4 unit; an additional transformation of GFP frame (from "Generic Framing Procedure") to an OPU2 unit with an extended OPU2 payload area; multiplexing of two ODU0 signals in an OPU1 unit; concept of low-order and high-order ODU units for alignment with the “one-stage multiplexing” specification described in clause 9.2 of recommendation 6.872; ODU0 signal multiplexing on an OPU2 or OPU3 unit; ODU2e signal multiplexing in an OPU3 unit; ODUj signal multiplexing in an OPU4 unit; multi-way interfaces OTU3 and OTU4; OTM-32r.m interface (“Optical Transport Module”, specified in recommendation G.959.1; extension of the scope of the APS / PCC channel (“Automatic Protection Switch / Protection Communication Channel”) of ODUk unit; parallel to serial conversion of 40GBASE-R and 100GBASE-R interface signals; robustness improvement to convert 40GSASE-R signals into OPU3 units.

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SUMMARY OF THE INVENTION

The embodiments of the present invention are intended to provide a method, a device and a system for assigning a tax port number, in which the tax port number is automatically obtained to improve the efficiency of allocation of the TPN number and reduce the error rate of TPN number assignment.

An embodiment of the present invention provides a method for assigning a tax port number, which includes:

receive a service path request message that is sent by a neighboring node and carries a type of service, in order to request the establishment of a service path used to support an ODU optical channel data unit service of the type of service;

determine, according to the service road request message, an OTU optical channel transport unit link used to support the ODU service, determine and reserve, according to the type of service in the service request message of service, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource, in which the assignment of the tax port number to the free tax interval resource comprises: if a few bytes of multiplex structure identifier, MSI (in English “Multiplex Structure Identifier”), in the OTU link indicate a type of service of the ODU service, obtain tax port numbers used by ODU services that have the same type as the ODU service on the OTU link and assign a tax port number other than the tax port numbers obtained to the tax interval resource li bre; or if the MSI bytes on the OTU link do not indicate a type of ODU service, obtain tax port numbers used by all types of ODU services on the OTU link and assign a tax port number other than the tax port numbers obtained to the resource of free tax interval; Y

send a service path confirmation message to the neighboring node, in which the service path confirmation message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the tax interval resource free.

An embodiment of the present invention further provides another method for assigning a tax port number, which includes:

determine an OTU link that is capable of supporting an ODU service of a defined service type, determine and reserve, according to the type of service defined, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource, in which the assignment of the tax port number to the free tax interval resource comprises: if a multiplex structure identifier bytes, MSI, in the OTU link indicate a type of service from the ODU service, obtain tax port numbers used by ODU services that have the same type as the ODU service on the OTU link and assign a tax port number different from the tax port numbers obtained to the free tax interval resource; or if the MSI bytes in the OTU link do not indicate the type of service of the ODU service, obtain the tax port numbers used by all types of ODU services in the OTU link and assign a tax port number other than the port numbers tributary obtained to the resource of free tributary interval;

sending a service path request message to a neighboring node, in which the service path request message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the interval resource free tax, and requests to establish a service path used to support the ODU service.

An embodiment of the present invention further provides a device for assigning a tax port number, which includes:

a message receiving module, configured to receive a service path request message that is sent by a neighboring node and carries a type of service, in order to establish a service path used to support a data unit service ODU optical channel of the service type;

an acquisition module, configured to determine, according to the service path request message, an OTU optical channel transport unit link used to support the ODU service, determine and reserve, according to the type of service in the service path request message, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource; Y

a confirmation sending module, configured to send a service path confirmation message to the neighboring node, in which the service path confirmation message carries information about the resource of

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free tax interval used to support the ODU service and the tax port number assigned to the free tax interval resource;

in which the procurement module comprises:

a first obtaining unit, configured to, if a few bytes of MSI multiplex structure identifier in the OTU link indicate a type of service of the ODU service, obtain tax port numbers used by ODU services that have the same type as the ODU service on the OTU link and assign a tax port number other than the tax port numbers obtained to the free tax interval resource; or

a second obtaining unit, configured to, if the MSI bytes in the OTU link do not indicate the type of service of the ODU service, obtain the tax port numbers used by all types of ODU services in the OTU link and assign a number of tax port other than the tax port numbers obtained from the free tax interval resource.

An embodiment of the present invention further provides a device for assigning a tax port number, which includes:

a obtaining module, configured to determine an OTU link that is capable of supporting an ODU service of a defined service type, determining and reserving, according to the type of service defined, a free tax interval resource used to support the service ODU on the OTU link, and assign a tax port number to the free tax interval resource; Y

a message sending module, configured to send a service path request message to a neighboring node, in which the service path request message carries information about the free tax interval resource used to support the ODU service and the Tax port number assigned to the free tax interval resource, and requests to establish a service path used to support the ODU service;

in which the procurement module comprises:

a first obtaining unit, configured to, if a few bytes of MSI multiplex structure identifier in the OTU link indicate a type of service of the ODU service, obtain tax port numbers used by ODU services that have the same type as the ODU service on the OTU link and assign a tax port number other than the tax port numbers obtained to the free tax interval resource; or

a second obtaining unit, configured to, if the MSI bytes in the OTU link do not indicate the type of service of the ODU service, obtain the tax port numbers used by all types of ODU services in the OTU link and assign a number of tax port other than the tax port numbers obtained from the free tax interval resource.

In the method, device and system for assigning a tax port number provided in the embodiments of the present invention, an OTU link used to support an ODU service is determined in accordance with a service path request message, and a resource of Free tax interval used to support the ODU service is determined and reserved on the OTU link according to the type of service in the service path request message; a tax port number is assigned to the free tax interval resource, and a service path confirmation message that carries the tax port number is sent. In this way, the tax port number is automatically obtained instead of being assigned manually through a network management system. Therefore, the efficiency of assigning the tax port number is improved. Because manual operation is avoided, the error rate of assignment of the tax port number is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

To more clearly illustrate the technical solutions in accordance with the embodiments of the present invention or in the prior art, the accompanying drawings to describe the embodiments or prior art are briefly introduced in the following. Clearly, the accompanying drawings in the following description are only some embodiments of the present invention, and persons of ordinary skill in the art can derive other drawings from the attached drawings without creative efforts.

Figure 1 is a schematic diagram of an applicable OTU link in an embodiment of the present invention;

Figure 2 is a schematic flow chart of a method for assigning a tax port number according to an embodiment of the present invention;

Figure 3 is a schematic flow chart of a method for assigning a tax port number in accordance with another embodiment of the present invention;

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Figure 4 is a schematic flow chart of a method for assigning a tax port number according to another embodiment of the present invention;

Figure 5 is a schematic flow chart of a method for assigning a tax port number in accordance with a further embodiment of the present invention;

Figure 6 is a schematic structural diagram of a device for assigning a tax port number in accordance with an embodiment of the present invention;

Figure 7 is a schematic structural diagram of a device for assigning a tax port number in accordance with another embodiment of the present invention;

Figure 8 is a schematic structural diagram of a device for assigning a tax port number according to another embodiment of the present invention;

Figure 9 is a schematic structural diagram of a device for assigning a tax port number in accordance with a further embodiment of the present invention;

Figure 10 is a schematic structural diagram of a system for assigning a tax port number in accordance with an embodiment of the present invention; Y

Figure 11 is a schematic structural diagram of a system for assigning a tax port number in accordance with another embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The technical solution of the present invention will be described clearly and completely in the following with reference to the attached drawings. It is obvious that the embodiments to be described are only one part instead of all the embodiments of the present invention. All other embodiments obtained by persons skilled in the art based on the embodiments of the present invention without creative efforts must fall within the scope of protection of the present invention.

Figure 1 is a schematic diagram of an applicable OTU link in an embodiment of the present invention. As shown in Figure 1, when a service path has to be established for an ODU service, if the ODU service passes through an OTU link between a first node and a neighbor node of the first node, specifically, in the case of establishing a service path used to transmit an ODU2 service between a service source node and a service destination node, for each segment of the OTU link (for example, an OTU3 link) through which the ODU2 service passes, The first node and the second node at two ends of the segment must know a tax port number assigned to the ODU2 service on the OTU3 link before the service path is established. For example, both the first node and the second node know that the tributary port number assigned to the service path of the ODU2 service is 1.

Figure 2 is a schematic flow chart of a method for assigning a tax port number in accordance with an embodiment of the present invention. As shown in Figure 2, the embodiment of the present invention includes the following steps:

Step 201: Receive a service path request message that is sent by a neighboring node and carries a type of service, in order to request the establishment of a service path used to support an oDu service of the type of service.

Step 202: determine, according to the service path request message, an OTU optical channel transport unit link used to support the ODU service, determine and reserve, according to the type of service in the request message of service path, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource.

Step 203: Send a service path confirmation message to the neighboring node, in which the service path confirmation message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the resource of free tax interval.

In this embodiment of the present invention, an entity for performing steps 201 to 203 may be a master node adjacent to the neighboring node. The master node can be a node located downstream of the neighboring node. After receiving the service path request message that is sent by the neighboring node and carries the type of service, the master node assigns a tax port number to the requested ODU service, and sends a service path confirmation message that carries the tax port number to the neighboring node so that the neighboring node also obtains the tax port number of the OTU link used to support the ODU service.

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In the method for assigning a tax port number in this embodiment of the present invention, an OTU optical channel transport unit link used to support the ODU service is determined in accordance with a service path request message received, and A free tax interval resource used to support the ODU service is determined and reserved on the OTU link according to the type of service in the service path request message; a tax port number is assigned to the free tax interval resource, and a service path confirmation message that carries the tax port number is sent to the neighboring node. In this way, the tax port number is automatically obtained instead of being assigned manually through a network management system. Therefore, the efficiency of assigning the tax port number is improved. Because manual operation is avoided, the error rate of assignment of the tax port number is reduced.

Figure 3 is a schematic flow chart of a method for assigning a tax port number in accordance with another embodiment of the present invention. As shown in Figure 3, the embodiment of the present invention includes the following steps:

Step 301: A master node receives a service path request message that is sent by a neighboring node and carries a type of service, in order to request the establishment of a service path used to support an ODU service of the type of service.

The master node and the neighboring node can specifically be a node located downstream and a node located upstream, respectively, in which the node located upstream and the node located downstream are only relative concepts. The master node in this embodiment of the present invention may also be a node located upstream in relation to another node in the OTN link, and the neighboring node may also be a node located downstream in relation to another node in the OTN link. The master node in this embodiment is a node that is capable of obtaining the tax port number on the OTN link, and the neighboring node is a node that requests the master node to obtain the tax port number on the OTN link. Specifically, the service path request message in this embodiment may be a path message requesting to establish a path and is part of a signaling protocol, resource reservation protocol - traffic engineering. ReserVation Protocol - Traffic Engineering, abbreviated RSVP-TE), in the generalized multi-protocol label switching (in English "Generalized Multi-Protocol Label Switching", abbreviated GMPLS). The type of service of the path to be established is specified in the service path request message. For example, if a service path of an ODU2 service has to be established, the type of service has to be specified as oDU2 in the service path request message.

Step 302: The master node determines, according to the service path request message, an OTU optical channel transport unit link used to support the ODU service, determines and reserves, according to the type of service in the service path request message, a free tax interval resource used to support the ODU service on the OTU link, and assigns a tax port number to the free tax interval resource.

There may be one or more OTU links between the master node and the neighboring node that are adjacently located. Before the tax interval resource is reserved, the master node has to select a link used to carry the ODU2 service as an OTU support link from at least one OTU link that is capable of supporting the ODU service that has this type of service. Alternatively, the neighboring node selects the link, and sends the link to the master node through a path confirmation message being served, and the master node knows the link used to support the ODU2 service from the path confirmation message of service.

It is assumed that the master node determines an OTU3 link as the OTU support link used to support the ODU2 service. In the OTN standard, the ODU2 service has to occupy 4 intervals of 16 tributary intervals of the OTU3 link. Therefore, the master node has to select 4 free tax intervals that are in free states among the 16 tax intervals to be reserved for the ODU2 service, and assign a tax port number to the 4 tax intervals selected.

The master node determines and reserves, according to the type of service in the service path request message, the free tax interval resource used to support the ODU service on the OTU link. Specifically, if the type of service in the service path request message is the ODU2 service, the master node obtains a tax port number used by the service whose service type is also ODU2 and already exists in the OTU3 link. If two ODU2 services already exist on the OTU3 link and the tax port numbers used by the two ODU2 services are a tax port number 1 and a tax port number 2 respectively, the master node assigns a TPN number to the new ODU2 service requested. by the neighboring node. Because the tax port number 1 and the tax port number 2 are already in use, the master node can assign other tax port numbers that are not yet used, for example, the tax port number 3 or the number of tax port 4, to the new ODU2 service requested by the neighboring node.

Specifically, the master node can assign a tax port number to the free tax interval resource in the following ways:

If the multiplex structure identifier bytes (in English “Multiplex Structure Identifier”, abbreviated MSI) in the OTU link can indicate the type of service of the ODU service, the tax port numbers used by the 5 ODU services that have the same type that the ODU service on the OTU link is obtained, and a tax port number other than the tax port numbers obtained is assigned to the free tax interval resource.

If the MSI bytes in the OTU link cannot indicate the type of service of the ODU service, the tax port numbers used by all types of ODU services in the OTU link are obtained, and a tax port number other than the number of The tax port obtained is assigned to the free tax interval resource.

10 Specifically, in the OTN standard, the MSI bytes in the OTU1 link, the OTU2 link and the OTU3 link can

indicate all the service type of the ODU service. Therefore, for OTU links of such types, the process of assigning a tax port number consists of: obtaining the tax port numbers used by ODU services that are of the same type and already exist in the OTU link, and assigning a Tax port number other than the tax port numbers obtained from the free tax interval resource. Assigning the tax port number 15 other than the tax port numbers obtained to the free tax interval resource, the value of the

Tax port number is different from the tax port numbers used by ODU services that are of the same type and already exist in the link.

For an OTU4 link, because the MSI bytes on the OTU4 link do not indicate the type of service of the ODU service, the specific process of assigning a tax port number to the OTU4 link consists of: obtaining the 20 tax port numbers used by ODU services that are of all types and already exist on the OTU4 link (instead of ODU services that are of the same type), assign a tax port number to the new ODU service requested by the neighboring node, and assign a number of a tax port other than the tax port numbers obtained from the free tax interval resource. By assigning the tax port number other than the tax port numbers obtained to the free tax interval resource, the value of the tax port number is different from those of the tax port numbers used by ODU services that are of all types (instead of ODU services that are the same type) and already exist in the link.

Step 303: The master node sends a service path confirmation message to the neighboring node, in which the service path confirmation message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the free tax interval resource.

30 The service path confirmation message can specifically be a resource reservation message (Resv) of the RSVP-TE protocol in GMPLS switching. The Resv message may include a tag object, and the tag object indicates information about the free tax interval resource used to support the ODU service requested to be established. In this embodiment, the tag object is extended, which is used to indicate to the neighboring node, which acts as the node located upstream, that the master node, which acts as the node located downstream, has reserved the tax interval specific selected in the ODU3 service, and also indicate the tax port number assigned by the master node, which acts as a node located downstream. Specifically, the format of the extended tag object is as follows:

+. +. +. +. +. + - K + - + - + _ + - + - + - + - +. + - + - + - + - + - + - + - + - + - | - + - + - + - | - + - + - + - l-

| OD (T) Uk | T | Res. | TPN | Bit Map |

+ - + - + - + _ + _ + - + - + - + - + - + - + - + - + - + - + - i - + - + - i --- i - + - -i - + - + - + - + - + - + - + - + - + - +

+ - + - +. + - + - + - + - + - i --- i - + - i - + - + - + - i --- i - + - + - + - + - i --- t - + - + - + - + - + - + - + - + - + - +

The OD (T) Uk field represents the type of link, and specifically, OD (T) Uk in this embodiment is ODU3; field 45 T represents the type of tax interval, for example, T = 0, which means that the type of tax interval supported by the OTU link is 2.5 G, and T = 1, which means that the type of tax interval supported by the OTU link is 1.25 G (certainly, reverse operations can be performed), and in this embodiment, T = 0. The Bit Map field means that the bitmap mode is applied, and indicates that the node downstream has reserved the specific tax interval of the OTU3 link for the ODU2 service. The bitmap length (Bit Map) is determined according to the type of link (namely, the ODUk field or the OTUk field) and a type of tax interval (namely, the T field). If the link includes n tax intervals in total (n is a positive integer), the length of the Bit Map field is n. The type of link in this embodiment is OTU3, and the type of tax interval is 2.5 G. Because the link OTU3 whose type of tax interval is 2.5 G has 16 tax intervals in total, the length of the

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Bit Map field is 16. The TPN field is used to indicate the value of the TPN number assigned by the node located downstream.

Step 304: If the neighboring node judges that the tax port number is available, the master node, according to the information about the free tax interval resource used to support the ODU service in the service path confirmation message, reservation the corresponding tax interval resource in the OTU link, and completes the establishment of the service path. If the neighboring node judges that the tax port number is not available, the master node receives a resource reservation error message sent by the neighboring node.

After receiving the service path confirmation message (which may be specifically a Resv message), the neighboring node, which acts as a node upstream, obtains the tax port number from the service path confirmation message, and Judges if the tax port number is available. If the tax port number is already used by another ODU2 service on the corresponding link, this represents that the tax port number is not available, and a resource reservation error message (ResvErr message) has to be sent to the master node , which acts as the node located downstream. Optionally, the master node can start over with step 302 to reallocate a tax port number. If not used, this represents that the tax port number is available, and the neighboring node, in accordance with the reserved tax interval indicated by the tag object on the OTU3 link, reserves the corresponding tax interval resource itself, and Stores the tax port number. In this way, the establishment of the service road is completed.

In addition, based on the embodiment of Figure 3, the assignment of tax interval can be automatically checked in a transport plane using the assigned tax port number, which may specifically include: if the service path is successfully established and the neighboring node multiplexes the ODU service in the tax interval reserved in the OTU link, the MSI multiplex structure identifier bytes corresponding to the reserved tax interval are filled with the value of the tax port number carried in the service path confirmation message , and therefore, the master node receives the MSI bytes from the OTU link.

The master node reads the value of the tax port number in the MSI bytes.

If the read value of the tax port number is equal to the value of the tax port number assigned to the free tax interval resource, the master node receives the ODU service in the reserved tax interval.

If the read value of the tax port number is different from the value of the tax port number assigned to the free tax interval resource, the master node sends an alarm message to a network management system.

Specifically, the illustration is given by taking an example in which the link service is the ODU2 and the OTU link is the OTU3. If the service path is successfully established, at the beginning of the ODU2 service transmission, the neighboring node multiplexes the ODU2 service in the tax interval reserved in the OTU3 link, and fills the MSI bytes corresponding to the reserved tax interval with the value of the number of tax port. The master node receives the MSI bytes from the OTU3 link, and reads the value of the tax port number in the MSI bytes corresponding to the tax interval reserved for the ODU2 service. If the value is the same as the value of the tax port number assigned by the master node in step 302, it is proved that the connection between the master node and the neighboring node is established correctly, and the master node can receive the ODU2 service from the reserved tax interval; and if not, an alarm message has to be sent to the network management system.

Automatic verification of the tax port number assignment in the transport plane avoids conflicts between tax port numbers generated in the process of assigning the tax port numbers automatically, and improves the reliability of assigning the tax port numbers automatically.

In the method for assigning a tax port number in this embodiment of the present invention, the master node determines, in accordance with a received service path request message, an OTU optical channel transport unit link used to support a ODU service, determines and reserves, according to the type of service in the service path request message, a free tax interval resource used to support the ODU service on the OTU link, and assigns a tax port number to the resource of free tax interval. Because the tax port number does not have to be assigned manually through the network management system, the efficiency of assigning the tax port number is improved. Because manual operation is avoided, the error rate of assignment of the tax port number is reduced. Additionally, the automatic check in the transport plane can also be implemented using the assigned tax port number.

Figure 4 is a schematic flow chart of a method for assigning a tax port number according to another embodiment of the present invention. As shown in Figure 4, the embodiment of the present invention includes the following steps:

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Step 401: determine an OTU link that is capable of supporting an ODU service of a defined service type, determine and reserve, according to the type of service defined, a free tax interval resource used to support the ODU service on the link OTU, and assign a tax port number to the free tax interval resource.

Step 402: Send a service path request message to a neighboring node, in which the service path request message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the Free tax interval resource, and requests to establish a service path used to support the ODU service.

In this embodiment of the present invention, an entity for performing step 401 and step 402 may be a master node adjacent to the neighboring node. The master node can be a node located upstream of the neighboring node. The master node sends the tax port number obtained to the neighboring node through a service path request message. In addition, the type of service defined in this embodiment of the present invention is obtained by the master node through a user request or a network management command, or by receiving a service path request message sent by the Neighbor node in the upstream direction of the master node. Certainly, the three preceding modes of obtaining should not be considered as limitations on the embodiments of the present invention, and any other mode is also appropriate provided that the type of service defined can be obtained in accordance with practical requirements.

In the method for assigning a tax port number in this embodiment of the present invention, an OTU link that is capable of supporting an ODU service having the type of service defined is determined, and a free tax interval resource used to support the ODU service is determined and reserved in the OTU link according to the type of service defined; a tax port number is assigned to the free tax interval resource, and a service path request message that carries the tax port number is sent to the neighboring node. In this way, the tax port number is assigned automatically instead of being assigned manually through a network management system. Therefore, the efficiency of assigning the tax port number is improved. Because manual operation is avoided, the error rate of assignment of the tax port number is reduced.

Figure 5 is a schematic flow chart of a method for assigning a tax port number in accordance with a further embodiment of the present invention. As shown in Figure 5, the embodiment of the present invention includes the following steps:

Step 501: A master node determines an OTU link that is capable of supporting an ODU service of a defined service type, determines and reserves, according to the type of service defined, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource.

The master node and a neighboring node can specifically be an upstream node and a downstream node respectively, in which the upstream node and the downstream node are relative concepts. The master node, in this embodiment of the present invention, may also be a node located downstream in relation to another node in the OTN network, and the neighboring node may also be a node located upstream in relation to another node in the network OTN In addition, the type of service defined is obtained by the master node through a user request or a network management command, or by receiving a service path request message sent by the neighboring node at the upstream address. of the master node. Certainly, the three preceding modes of obtaining should not be considered as limitations to the realization of the present invention, and any other mode is also appropriate provided that the type of service defined can be obtained in accordance with practical requirements. In this embodiment, the illustration is given by taking an example in which the type of service defined is specifically the ODU2 service.

The master node has to determine, according to the type of service defined, the link used to support the ODU service between the master node and the neighboring node, which acts as the node located downstream, and determine the free tax interval used to support the type of service defined in the link. For example, the master node, which acts as the node located upstream, according to the demand for the type of service defined, determines an OTU3 link used to support the ODU2 service. It is assumed that the type of tax interval supported by the OTU3 link is 2.5 G. The master node, which acts as the node located upstream, selects 4 free tax intervals that are in free states between the 16 tax intervals of the OTU3 link, reserve the free tax intervals for the ODU2 service, and assign a tax port number to the 4 tax intervals selected.

The master node can assign a tax port number to the free tax interval resource as follows:

If some MSI bytes in the OTU link can indicate the type of service of the ODU service, the tax port numbers used by the oDu services that have the same type as the ODU service in the OTU link are

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obtained, and a tax port number other than the tax port numbers obtained is assigned to the free tax interval resource.

If the MSI bytes in the OTU link cannot indicate the type of service of the ODU service, the tax port numbers used by all types of ODU services in the OTU link are obtained, and a tax port number other than the number of The tax port obtained is assigned to the free tax interval resource.

Specifically, in the OTN standard, the MSI bytes on the OTU3 link can indicate the service type of the ODU service. Therefore, if the type of service that is obtained by the master node and already exists in the OTU3 link is also the tax port number used by the ODU2 service, and if two ODU2 services already exist in the OTU3 link, and the Tax port numbers used by the two ODU2 services are the tax port number 1 and the tax port number 2 respectively, the master node assigns a tax port number to the new ODU2 service. Because the tax port number 1 and the tax port number 2 are already used, the master node has to assign a tax port number that is not yet used and different from the tax port number 1 and the tax port number 2, for example, a tax port number 3 or a tax port number 4 to the new ODU2 service.

If the MSI bytes in the OTU link cannot indicate the type of service of the ODU service, the process of assigning the tax port number is slightly different from the preceding process in which: the master node obtains the tax port numbers used by the services ODUs that are the same type and already exist in the OTU link, and then assign a tax port number to the new ODU service. Because the tax port number other than the tax port numbers obtained is assigned to the free tax interval resource, the value of the tax port number is different from those of the tax port numbers used by ODU services that are of the same type and exist in the link.

Specifically, for an OTU4 link whose service type defined is the ODU4 service, the process of assigning a tax port number consists of: obtaining the tax port numbers used by ODU services that are of all types (not just services ODUs that are of the same type) and already exist in the OTU4 link, and assign a TPN number to the new ODU service, in which the value of the TPN number has to be different from the tax port numbers used by ODU services that are of all types (not only ODU services that are the same type) and already exist in the link.

Step 502: The master node sends a service path request message to the neighboring node, in which the service path request message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the free tax interval resource, and requests to establish a service path used to support the ODU service.

The service path request message sent by the master node, which acts as the upstream node, to the neighboring node, which acts as the downstream node, can specifically be a path message, and the message on the way it carries a tag object. The label object is used to indicate the free tax interval reserved by the master node and the tax port number assigned by the master node. The tag object can be included in the path message as a sub-object of a tag group object. The format of the label object is the same as the label described in step 303 in the embodiment shown in Figure 3, which is not described further here.

Step 503: If the neighboring node judges that the tax port number is available, according to the information about the free tax interval resource used to support the ODU service in the service path request message, the interval resource corresponding tax on the OTU link is reserved, and the establishment of the service path is completed; and if the neighboring node judges that the tax port number is not available, a resource reservation error message sent by the neighboring node is received.

After receiving the service path request message (which may be specifically a Path message), the neighboring node, which acts as the downstream node, obtains the tax port number from the service path request message, and then judge if the tax port number is available. If the tax port number is already used by another ODU2 service on the corresponding link, which represents that the tax port number is not available, a path error message (PathErr message) has to be sent to the master node, which acts as the node located upstream. Optionally, the master node can start over with step 501 to reallocate a tax port number. If not used, which means that the tax port number is available, the neighboring node, which acts as the node located downstream, in accordance with the reserved tax interval indicated by the tag object on the OTU3 link, in which the label object specifically indicates information about the free tax interval resource that supports the type of service defined, reserves the corresponding tax interval resource itself, stores the tax port number, and returns a resource reservation message (which can specifically be a Resv) message to the master node to complete the establishment of the service path.

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In the method for assigning a tax port number in this embodiment of the present invention, an OTU link used to support an ODU service having the type of service defined is determined, and a free tax interval resource used to support the ODU service. it is determined and reserved in the OTU link according to the type of service defined; a tax port number is assigned to the free tax interval resource, and a service path request message that carries the tax port number is sent to the neighboring node. In this way, the tax port number is assigned automatically instead of being assigned manually through a network management system. Therefore, the efficiency of assigning the tax port number is improved. Because manual operation is avoided, the error rate of assignment of the tax port number is reduced. Additionally, automatic checking in a transport plane can also be implemented using the assigned tax port number.

In addition, based on the embodiment shown in Figure 5, the tax interval assignment can be automatically checked in the transport plane using the assigned tax port number. The automatic check includes: if the service path is established successfully, multiplex the ODU service in the tax interval reserved in the OTU link, and fill in the MSI bytes corresponding to the tax interval reserved with the value of the tax port number assigned to the resource of free tax interval.

If the value of the tax port number read by the neighboring node from the MSI bytes is equal to the value of the tax port number carried in the service path request message received by the neighboring node, the neighboring node receives the ODU service in the reserved tax interval.

If the value of the tax port number read by the neighboring node from the MSI bytes is different from the value of the tax port number carried in the service path request message received by the neighboring node, the neighboring node sends an alarm message to a network management system.

Specifically, the illustration is given by taking an example in which the link service is the ODU2 and the OTU link is the OTU3. If the service path is successfully established, at the beginning of the ODU2 service transmission, the master node multiplexes the ODU2 service in the tax interval reserved in the OTU3 link, and fills the MSI bytes corresponding to the reserved tax interval with the value of the number of the tax port assigned in step 501. The neighboring node, which acts as the node located downstream, receives data from the OTU3 link, and reads the value of the tax port number in the MSI bytes corresponding to the tax interval reserved for the service ODU2. If the value is equal to the value of the tax port number carried in the service path request message received by the neighboring node in steps 502 to 503 shown in Figure 5, this indicates that the service path between the node master and the neighboring node is set correctly, and the neighboring node can receive the ODU2 service in the reserved tax interval; and if not, an alarm message has to be sent to the network management system.

Automatic verification of the tax port number assignment in the transport plane avoids conflicts between tax port numbers generated in the process of assigning the tax port numbers automatically, and improves the reliability of assigning the tax port numbers automatically.

Figure 6 is a schematic structural diagram of a device for assigning a tax port number in accordance with an embodiment of the present invention. This embodiment of the present invention can implement the processes of the method shown in Figure 2 and Figure 3. As shown in Figure 6, the embodiment of the present invention includes a message receiving module 61, an obtaining module 62 , and a confirmation sending module 63.

The message receiving module 61 is configured to receive a service path request message that is sent by a neighboring node and carries a type of service, in order to establish a service path used to support a service unit service. ODU optical channel data of the type of service. The obtaining module 62 is configured to determine, in accordance with the service path request message received by the message receiving module 61, an OTU optical channel transport unit link used to support the ODU service, determine and reserve, according to the type of service in the service path request message, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource. The confirmation sending module 63 is configured to send a service path confirmation message obtained by the obtaining module 62 to the neighboring node, in which the service path confirmation message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the free tax interval resource.

In the device for assigning a tax port number in this embodiment of the present invention, the obtaining module 62 determines, in accordance with a service path request message received by the message receiving module 61, a unit link OTU optical channel transport used to support an ODU service, determines and reserves, according to the type of service in the service path request message, a free tax interval resource used to support the ODU service on the OTU link , and assigns a number of

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tax port to the resource of free tax interval. The confirmation sending module 63 sends a service path confirmation message that is obtained by the obtaining module 62 and carries the tax port number to the neighboring node. In this way, the tax port number is assigned automatically instead of being assigned manually through a network management system. Therefore, the efficiency of assigning the tax port number is improved. Because manual operation is avoided, the error rate of assignment of the tax port number is reduced.

Figure 7 is a schematic structural diagram of a device for assigning a tax port number in accordance with another embodiment of the present invention. This embodiment of the present invention can implement the processes of the method shown in Figure 2 and Figure 3. As shown in Figure 7, the embodiment of the present invention includes a message receiving module 71, an obtaining module 72 , a confirmation sending module 73, a byte receiving module 74, a reading module 75, a service receiving module 76, and an alarm sending module 77.

The message receiving module 71 is configured to receive a service path request message that is sent by a neighboring node and carries a type of service, in order to establish a service path used to support a service unit service. ODU optical channel data of the type of service. The obtaining module 72 is configured to determine, in accordance with the service path request message received by the message receiving module 71, an OTU optical channel transport unit link used to support the ODU service, determine and reserve, according to the type of service in the service path request message, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource. The confirmation sending module 73 is configured to send a service path confirmation message obtained by the obtaining module 72 to the neighboring node, in which the service path confirmation message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the free tax interval resource.

If the neighboring node judges that the tax port number is available, the neighboring node, according to the information about the free tax interval resource used to support the ODU service in the service path confirmation message, reserves the resource of corresponding tax interval on the oTu link, and complete the establishment of the service path. If the neighboring node judges that the tax port number is not available, the message reception module 71 receives a resource reservation error message sent by the neighboring node.

Additionally, the obtaining module 72 can also include a first obtaining unit 721 and / or a second obtaining unit 722. If a few bytes of MSI multiplex structure identifier in the OTU link can indicate the type of service of the ODU service, the First obtaining unit 721 obtains the tax port numbers used by the ODU services that have the same type as the ODU service on the OTU link, and assigns a tax port number different from the tax port numbers obtained to the tax interval resource free. If the MSI bytes in the OTU link cannot indicate the service type of the ODU service, the second obtaining unit 722 obtains the tax port numbers used by all types of ODU services in the OTU link, and assigns a port number tributary other than the tax port numbers obtained to the free tax interval resource.

If the service path is established successfully and the neighboring node multiplexes the ODU service in the tax interval reserved in the OTU link, the MSI multiplex structure identifier bytes corresponding to the reserved tax interval are filled with the value of the port number ported ported in the service path confirmation message, and therefore, the byte receiving module 74 receives the MSI bytes from the OTU link, and the reading module 75 reads the value of the tax port number in the received mSi bytes by the byte receiving module 74. If the read value of the tax port number is equal to the value of the tax port number assigned to the free tax interval resource, the service reception module 76 receives the ODU service in the reserved tax interval; and if the read value of the tax port number is different from the value of the tax port number assigned to the free tax interval resource, the alarm sending module 77 sends an alarm message to the network management system.

In the device for assigning a tax port number in this embodiment of the present invention, the obtaining module 72 determines, in accordance with a service path request message received by the message receiving module 71, a unit link OTU optical channel transport used to support the ODU service, determines and reserves, according to the type of service in the service path request message, a free tax interval resource used to support the ODU service on the OTU link , and assigns a tax port number to the free tax interval resource. The confirmation sending module 73 sends a service path confirmation message that carries the tax port number obtained by the obtaining module 72 to the neighboring node. In this way, the tax port number is automatically obtained instead of being assigned manually through a network management system. Therefore, the efficiency of assigning the tax port number is improved. Because manual operation is avoided, the allocation error rate of the

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Tax port number is reduced. Additionally, an automatic check in the transport plane can be implemented using the assigned tax port number.

Figure 8 is a schematic structural diagram of a device for assigning a tax port number according to another embodiment of the present invention. This embodiment of the present invention can implement the processes of the method shown in Figure 4 and Figure 5. As shown in Figure 8, the embodiment of the present invention includes a obtaining module 81 and a message sending module 82 .

The obtaining module 81 is configured to determine an OTU link that is capable of supporting an ODU service of a defined type of service, determining and reserving, according to the type of service defined, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource. The message sending module 82 is configured to send a service path request message to a neighboring node, in which the service path request message carries information about the free tax interval resource that is obtained by the service module. Obtaining 81 and is used to support the ODU service and the tax port number assigned to the free tax interval resource, and requests to establish a service path used to support the ODU service.

In the device for assigning a tax port number in this embodiment of the present invention, the obtaining module 81 determines an OTU link that is capable of supporting an ODU service that has the defined service type, determines and reserves, in accordance with the type of service defined, a free tax interval resource used to support the ODU service on the OTU link, and assigns a tax port number to the free tax interval resource. The message sending module 82 sends a service path request message that is obtained by the obtaining module 81 and carries the tax port number to the neighboring node. In this way, the tax port number is automatically obtained instead of being assigned manually through a network management system. Therefore, the efficiency of assigning the tax port number is improved. Because manual operation is avoided, the error rate of assignment of the tax port number is reduced. Additionally, an automatic check in the transport plane can be implemented using the assigned tax port number.

Figure 9 shows a schematic structure of a device for assigning a tax port number according to another embodiment of the present invention. This embodiment of the present invention can implement the processes of the method shown in Figure 4 and Figure 5. As shown in Figure 9, the device for assigning a tax port number 90 in this embodiment of the present invention includes a module Obtaining 91, a message sending module 92, a message receiving module 93, and a byte filling module 94.

The obtaining module 91 is configured to determine an OTU link that is capable of supporting an ODU service of a defined service type, determining and reserving, according to the type of service defined, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource. The message sending module 92 is configured to send a service path request message to a neighboring node, in which the service path request message carries information about the free tax interval resource that is obtained by the service module. Obtaining 91 and is used to support the ODU service and the tax port number assigned to the free tax interval resource, and requests to establish a service path used to support the ODU service.

In addition, if the neighboring node judges that the tax port number is available, the neighboring node, according to the information about the free tax interval resource used to support the ODU service in the service path request message, reserves the corresponding tax interval resource on the oTu link, and completes the establishment of the service path. If the neighboring node judges that the tax port number is not available, the message reception module 93 receives a resource reservation error message sent by the neighboring node.

In addition, the obtaining module 91 may also include: a first obtaining unit 911 and / or a second obtaining unit 912. If a few bytes of MSI multiplex structure identifier in the OTU link can indicate the type of service of the ODU service, the first obtaining unit 911 obtains the tax port numbers used by the ODU services that have the same type as the ODU service on the OTU link, and assigns a tax port number different from the tax port numbers obtained to the interval resource free tax. If the MSI bytes in the OTU link cannot indicate the type of service of the ODU service, the second obtaining unit 912 obtains the tax port numbers used by all types of ODU services in the OTU link, and assigns a port number tributary other than the tax port numbers obtained to the free tax interval resource.

In addition, if the service path is successfully established, the byte fill module 94 multiplexes the ODU service in the tax interval reserved in the OTU link, and fills the MSI bytes corresponding to

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Tax interval reserved with the value of the tax port number assigned to the free tax interval resource.

In the device for assigning a tax port number in this embodiment of the present invention, the obtaining module 91 determines an OTU link that is capable of supporting an ODU service that has the defined type of service, determines and reserves, in accordance with the type of service defined, a free tax interval resource used to support the ODU service on the OTU link, and assigns a tax port number to the free tax interval resource. The message sending module 92 sends a service path request message that is obtained by the obtaining module 91 and carries the tax port number to the neighboring node. In this way, the tax port number is automatically obtained instead of being assigned manually through a network management system. Therefore, the efficiency of assigning the tax port number is improved. Because manual operation is avoided, the error rate of assignment of the tax port number is reduced. Additionally, an automatic check in the transport plane can be implemented using the assigned TPN number.

Figure 10 is a schematic structural diagram of a system for assigning a tax port number in accordance with an embodiment of the present invention. As shown in Figure 10, the embodiment includes a first device for assigning a tax port number 101 and a first device for receiving a tax port number 102.

The first device for assigning a tax port number 101 is configured to: receive a service path request message that is sent by a first device to receive a tax port number and carries a type of service, in order to establish a service path used to support an ODU optical channel data unit service of the service type; determine, according to the service road request message, an OTU optical channel transport unit link used to support the ODU service, determine and reserve, according to the type of service in the service request message of service, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource; and send a service path confirmation message to the first device to receive a tax port number 102, in which the service path confirmation message carries information about the free tax interval resource used to support the ODU service and the number of the tax port assigned to the free tax interval resource.

In this embodiment of the present invention, the first device for assigning a tax port number 101 may be a master node adjacent to the first device for receiving a tax port number 102, and the master node may be a node located downstream of the first device for receiving a tax port number 102.

In the system for assigning a tax port number in this embodiment of the present invention, the first device for assigning a tax port number 101 determines, according to a service path request message, an OTU link used to support the type of service, determines, according to the type of service in the service path request message, a free tax interval resource used to support the type of service on the OTU link, assigns a tax port number to the resource of Free tax interval, and sends a service path confirmation message to the first device to receive a tax port number 102. Thus, the tax port number is automatically assigned instead of being manually assigned through a system of network management Therefore, the efficiency of assigning the tax port number is improved. Because manual operation is avoided, the error rate of assignment of the tax port number is reduced.

Figure 11 is a schematic structural diagram of a system for assigning a tax port number in accordance with another embodiment of the present invention. As shown in Figure 11, the embodiment includes a second device for assigning a tax port number 111 and a second device for receiving a tax port number 112.

The second device for assigning a tax port number 111 is configured to: determine an OTU link that is capable of supporting an ODU service of a defined service type, determine and reserve, according to the type of service defined, a resource of Free tax interval used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource. The second device for receiving a tax port number 112 sends a service path request message, in which the service path request message carries information about the free tax interval resource used to support the ODU service and the service number. Tax port assigned to the free tax interval resource, and requests to establish a service path used to support the ODU service.

In this embodiment of the present invention, the second device for assigning a tax port number 111 may be a master node adjacent to the second device for receiving a tax port number 112, and the

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master node can be a node located upstream of the second device to receive a tax port number 112.

In the system for assigning a tax port number in this embodiment of the present invention, the second device for assigning a tax port number 111 determines an OTU link that is capable of supporting the type of service defined, determines, in accordance with the defined service type, a free tax interval resource used to support the type of service on the OTU link, assigns a tax port number to the free tax interval resource, and sends the tax port number to the second device to receive a number of tax port 112 through a service path request message. In this way, the tax port number is assigned automatically instead of being assigned manually through a network management system. Therefore, the efficiency of assigning the tax port number is improved. Because manual operation is avoided, the error rate of assignment of the tax port number is reduced.

In the embodiments of the present invention, in addition the label format in the existing RSVP-TE signaling protocol can be extended to transmit the tax port number, a <RSVP_HOP> object in the Path message or the Resv message in the RSVP protocol -TE can be used to carry the tax port number. Alternatively, a new tax port number object is added directly to the <flow descriptor list> object of the Path message or the Resv message to carry the tax port number.

Specifically, the illustration is given by taking an example of a Path message and a Resv message in the existing RSVP-TE protocol. The formats of the Path message and the Resv message in the existing RSVP-TE protocol are as follows:

<Path Message> :: = <Common Header> [<INTEGRITY>]

[[<MESSAGE ID ACK> | <MESSAGE_ID_NACK>] ...]

[<MESSAGE_ID>]

<SESSION> <RSVP_HOP>

<TIME_VALUES>

[<EXPLICIT_ROUTE>]

<LABEL_REQUEST>

[<PROTECTION>]

[<LABEL_SET> ...]

[<SESSION_ATTRIBUTE>]

[<NOTIFY_REQUEST>]

[<ADMIN_STATUS>]

[<POLICY_DATA> ...]

<sender descriptor>

<Resv Message> :: = <Common Header> [<INTEGRITY>]

[[<MESSAGE_ID_ACK> | <MESSAGE_ID_NACK>] ...]

[<MESSAGE_ID>]

<SESSION> <RSVP_HOP>

<TIME_VALUES>

[<RESV_CONFIRM>] [<SCOPE>]

[<NOTIFY_REQUEST>]

[<ADMIN_STATUS>]

[<POLICY_DATA> ...]

<STYLE> <flow descriptor list>

“<>” Indicates an object in the message; "[]" Means that the content is optional; "<xx> ..." means that a message can include multiple objects of one type xx; and the <flow descriptor list> object in the Resv message includes multiple sub-objects.

5 In addition, a sub-object (a sub-object of the tax port number, namely a TPN sub-object) can be added in the <PSVP_HOP> object in the Path message or the Resv message in the RSVP-TE protocol existing, and is defined as follows:

0 12 3

01234567890123456789012345678901 + - t - + - + - i - + - i --- i - + - + - + - + - t - + - + - + - + - + - + - + - + - + - + - t - + - + - t - + - + - + - + - + - + | Length | Class-Num | C-Type

+ - + - + - + _ + _- K + - + - + - + - + - + - k + - + - + - + - k + - + - k + - + - + - K + - k + - -k + - + - + - +

| ODU Type | TPN | Reserved |

+. + .- i -. + .- t -. +. +. +. + .- i -.- i -. + .- i -. + .- (-. +. +. +. +. + .- i -.- (-. +. +. +. + .- i -. +. +. +. +. + - +

fifteen

Length represents the length of the object, and Class-Num and C-Type indicate the type of the object. In this embodiment of the present invention, any unused value of Class-Num and C-Type can be used to indicate that the object is a TPN object, for example, Class-Num = 10, and C-Type = 1. The TPN field indicates the value of the TPN number assigned by the node. Optionally, the object may also include an ODU type field to indicate the type of service 20 ODU to be established; and Reserved is a reserved field, which is not necessary in the realization of the present invention and is reserved for future use.

Alternatively, an object (a tax port number object, namely a TPN object) is added directly in the Path message or the Resv message in the existing RSVP-TE protocol, and is defined as follows:

0 12 3

01234567890123456789012345678901 + - + - + - K + _ + _ + _ + _ + - + - + - + _ + _ + _ + _- | -_- | -_ + - + - | -_- | -_ - | -_- | -_- | -_ + _ + _ + _- | -_- | - + _ + _ + _ +

| Length | Class-Num | C-Type |

+. +. +. +. +. +. +. +. +. +. + .- i -. + _ +. +. +. +. +. +. +. +. + - +. +. + .- i -.- i -.- l -.- l -.- l -.- (-. +. +

| ODU Type | TPN | Reserved |

-K-K + - K + - + - KK-K + - + - + - K + - + - + - + - KK-K + - + - + - + - + - + - + - I --- I --- I - + - I - +

The fields of this TPN object have similar definitions to the fields of the TPN sub-object described above, which are not described further here.

Those with ordinary experience in the art should understand that all or part of the steps of the method according to the embodiments of the present invention can be implemented by a program that gives instructions to relevant hardware. The program can be stored in a computer readable storage medium. When the program is executed, the steps of the method according to the embodiments of the present invention are performed. The storage medium may be any medium that is capable of storing program codes, such as a read-only memory (ROM), a random access memory (RAM) of the "Random Access Memory" ”), A magnetic disk, and an optical disk.

Finally, it should be noted that the above embodiments are provided merely to describe the technical solutions of the present invention, but are not intended to limit the present invention. It should be understood by persons of ordinary skill in the art that although the present invention has been described in detail with reference to the embodiments, modifications may be made to the technical solutions described in the embodiments, or equivalent substitutions of some technical characteristics may be made in The technical solutions, provided that such modifications or substitutions do not depart from the scope of the present invention.

Claims (14)

5 10 fifteen twenty 25 30 35 40 Four. Five fifty 1. A method for assigning a tax port number, which comprises: receiving (201) a service path request message that is sent by a neighboring node and carries a type of service, in order to request the establishment of a service path used to support an optical channel data unit service , ODU, of the type of service; determine (202), according to the service path request message, an optical channel transport unit link, OTU, used to support the ODU service, determine and reserve, according to the type of service in the message of service path request, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource, in which the assignment of the tax port number to the resource of Free tax interval comprises: if a few bytes of multiplex structure identifier, MSI, in the OTU link indicate a type of service of the ODU service, obtain tax port numbers used by ODU services that have the same type as the ODU service in the OTU link and assign a tax port number other than the tax port numbers obtained to the free tax interval resource; or if the MSI bytes on the OTU link do not indicate a type of ODU service, obtain tax port numbers used by all types of ODU services on the OTU link and assign a tax port number other than the tax port numbers obtained to the resource of free tax interval and send (203) a service path confirmation message to the neighboring node, in which the service path confirmation message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the resource of free tax interval. 2. The method according to claim 1, wherein after sending the service path confirmation message to the neighboring node, the method further comprises: If the neighboring node judges that the tax port number is available, according to the information about the free tax interval resource used to support the ODU service in the service path confirmation message, reserve a corresponding tax interval resource at the OTU link, and complete the establishment of the service path; Y If the neighboring node judges that the tax port number is not available, receive a resource reservation error message sent by the neighboring node. 3. The method according to claim 2, further comprising: If the service path is successfully established and the neighboring node multiplexes the ODU service in the tax interval reserved in the OTU link, fill in the MSI multiplex structure identifier bytes corresponding to the reserved tax interval with a value of the tax port number carried in the service path confirmation message, and therefore receive the MSI bytes from the OTU link; read the value of the tax port number in the MSI bytes; if the reading value of the tax port number is equal to the value of the tax port number assigned to the free tax interval resource, receive the ODU service in the reserved tax interval; Y If the reading value of the tax port number is different from the value of the tax port number assigned to the free tax interval resource, send an alarm message to a network management system. 4. A method for assigning a tax port number, which comprises: determine (401) an optical channel transport unit link, OTU, which is capable of supporting an optical channel data unit service, ODU, of a defined type of service, determine and reserve, according to the type of defined service, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource, in which the assignment of the tax port number to the free tax interval resource comprises : if a few bytes of multiplex structure identifier, MSI, in the OTU link indicate a type of service of the ODU service, obtain tax port numbers used by ODU services that have the same type as the ODU service in the OTU link and assign a tax port number other than the tax port numbers obtained from the free tax interval resource; or if the MSI bytes in the OTU link do not indicate the type of service of the ODU service, obtain the tax port numbers used by all types of ODU services in the OTU link and assign a tax port number other than the port numbers tributary obtained to the resource of free tributary interval; Y 5 10 fifteen twenty 25 30 35 40 Four. Five send (402) a service path confirmation message to a neighboring node, in which the service path confirmation message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the Free tax interval resource, and requests to establish a service path used to support the ODU service. 5. The method according to claim 4, wherein after sending the service path request message to the neighboring node, the method further comprises: if the neighboring node judges that the tax port number is available, reserve a corresponding tax interval resource on the OTU link according to the information about the free tax interval resource used to support the ODU service in the road request message of service, and complete the establishment of the service path; or If the neighboring node judges that the tax port number is not available, receive a resource reservation error message sent by the neighboring node. 6. The method according to claim 5, further comprising: if the service path is established successfully, multiplex the ODU service in the tax interval reserved in the OTU link and fill in MSI bytes corresponding to the tax interval reserved with a value of the tax port number assigned to the free tax interval resource; if a read value of the tax port number read by the neighboring node from the MSI bytes is equal to the value of the tax port number carried in the service path request message received by the neighboring node, receive, from the neighboring node, the ODU service in the reserved tax interval; Y If a value of the tax port number read by the neighboring node from the MSI bytes is different from the value of the tax port number carried in the service path request message received by the neighboring node, send an alarm message to a system Network management 7. A device for assigning a tax port number, comprising: a message receiving module (61, 71), configured to receive a service path request message that is sent by a neighboring node and carries a type of service, in order to request the establishment of a used service path to support an optical channel data unit service, ODU, of the service type; an acquisition module (62, 72), configured to determine, according to the service path request message, an optical channel transport unit link, OTU, used to support the ODU service, determine and reserve, of according to the type of service in the service path request message, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource; Y a confirmation sending module (63, 73), configured to send a service path confirmation message to the neighboring node, in which the service path confirmation message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the free tax interval resource; in which the procurement module comprises: a first obtaining unit (721), configured to, if a few bytes of MSI multiplex structure identifier in the OTU link indicate a service type of the ODU service, obtain tax port numbers used by the ODU services that have the same type as the ODU service on the OTU link and assign a tax port number other than the tax port numbers obtained to the free tax interval resource; or a second obtaining unit (722), configured to, if the MSI bytes in the OTU link do not indicate the type of service of the ODU service, obtain the tax port numbers used by all types of ODU services in the OTU link and assign a tax port number other than the tax port numbers obtained from the free tax interval resource. 8. The device according to claim 7, wherein: The message receiving module is further configured to, if the neighboring node judges that the tax port number is not available, receive a resource reservation error message sent by the neighboring node. 9. The device according to claim 8, further comprising: 5 10 fifteen twenty 25 30 35 40 Four. Five a byte receiving module, configured to: if the service path is successfully established and the neighboring node multiplexes the ODU service in the reserved tax interval on the OTU link, fill in a few bytes of MSI multiplex structure identifier corresponding to the reserved tax interval with a value of the tax port number carried in the service path confirmation message, and therefore receive the MSI bytes from the OTU link; a read module, configured to read the value of the tax port number from the MSI bytes; a service reception module, configured for, if the read value of the tax port number is equal to the value of the tax port number assigned to the free tax interval resource, receive the ODU service in the reserved tax interval; Y An alarm sending module, configured for, if the read value of the tax port number is different from the value of the tax port number assigned to the free tax interval resource, send an alarm message to a network management system. 10. A device for assigning a tax port number, comprising: an acquisition module (81, 91), configured to determine an optical channel transport unit link, OTU, which is capable of supporting an optical channel data unit service, ODU, of a defined type of service, determine and reserve, according to the type of service defined, a free tax interval resource used to support the ODU service on the OTU link, and assign a tax port number to the free tax interval resource; Y a message sending module (82, 92), configured to send a service path request message to a neighboring node, in which the service path request message carries information about the free tax interval resource used to support the ODU service and the tax port number assigned to the free tax interval resource, and requests to establish a service path used to support the ODU service; in which the procurement module comprises: a first obtaining unit (911), configured to, if a few bytes of MSI multiplex structure identifier in the OTU link indicate a service type of the ODU service, obtain tax port numbers used by the ODU services that have the same type as the ODU service on the OTU link and assign a tax port number other than the tax port numbers obtained to the free tax interval resource; or a second obtaining unit (912), configured to, if the MSI bytes in the OTU link do not indicate the type of service of the ODU service, obtain the tax port numbers used by all types of oDu services in the OTU link and assign a tax port number other than the tax port numbers obtained from the free tax interval resource. 11. The device according to claim 10, further comprising: a message receiving module, configured to, if the neighboring node judges that the tax port number is not available, receive a resource reservation error message sent by the neighboring node. 12. The device according to claim 11, further comprising: a byte filling module, configured to, if the service path is established successfully, multiplex the ODU service in the tax interval reserved in the OTU link and fill in MSI bytes corresponding to the tax interval reserved with a value of the tax port number assigned to the free tax interval resource. 13. A system for assigning a tax port number, comprising a first device for assigning a tax port number according to any one of claims 7-9 and a first device for receiving a tax port number, wherein the first device To receive a tax port number is the neighboring node. 14. A system for assigning a tax port number, comprising a second device for assigning a tax port number according to any one of claims 10-12 and a second device for receiving a tax port number, wherein the second device To receive a tax port number is the neighboring node.